After searching quite a bit, I found this solution https://www.htpcguides.com/make-deluge-automatically-stop-seeding-when-complete/ which works great on Windows i.e. in Deluge Daemon mode change Queue settings and seed ratio to 0, however, if you make any changes in the Deluge for Windows program the Daemon takes the latest settings of seed ratio as 0.5 since that is the lowest it can go in the Deluge for Windows program. Or am I missing something?

So is it possible to remove a torrent after it completes via a script that runs via the Execute Plugin on Torrent Complete? or would my best bet be in always going back to Deluge Daemon and changing the settings back to Queue and seed ratio 0 every time I make a change in settings in Deluge for Windows?